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The Met Office weather warning for the predicted weekend thunderstorms has been upgraded from yellow to amber for most of England and Wales on Saturday.

Thunderstorms have already hit some parts of the Anglia region through Friday morning but more downpours are expected over the weekend.

Heatwave conditions are expected across the region today with temperatures forecast to rise to 32°C (90°F)

"Several areas of heavy, thundery showers will develop over England and Wales from Friday night before moving northwards during Saturday. Not everywhere within the warning area will see thunderstorms, and indeed some spells of warm sunshine are expected at times, but where thunderstorms do form, some torrential downpours are likely with frequent lightning, large hail and locally strong gusts. Significant flooding is possible where these do occur from surface water as well as from small, fast-responding watercourses."

The Met Office has issued a yellow weather warning for further heavy rain in Cambridgeshire, Essex, Norfolk, Suffolk and Lincolnshire.

The warning is in force from noon on Sunday 13 July until 7pm

The Met Office says: "Heavy showers and isolated thunderstorms are likely to develop across some eastern parts of England during Sunday afternoon.

"The public should be aware that localised downpours could lead to temporary surface water flooding, such impacts perhaps most likely where heavy thundery showers have occurred during the previous 24 hours."

The Chief Forecaster's assessment: "Rain will clear from the east this morning, but as the cloud thins and breaks to allow some sunshine, so heavy showers and isolated thunderstorms are likely to develop for the afternoon.

"Some of the showers may be slow-moving with the potential for a few places to see around 20 mm of rain within an hour. Showers should die out more rapidly this evening than on Saturday evening."

The warning says: "Heavy showers and thunderstorms will continue to move east across East Anglia during the next couple of hours, with a risk of further isolated thunderstorms developing overnight.

"The public should be aware that localised downpours could lead to temporary surface water flooding."

The Met Office Chief Forecaster's assessment: "A line of thunderstorms is currently bringing locally very heavy rain with 15-25 mm of rain falling within an hour in a few places. These will move eastwards, but there is the possibility of further thundery downpours developing overnight."

Rainfall radar at 9.55pm showing the line of thunderstorms through Norfolk, Suffolk and Essex. Credit: Met Office / Google Maps